[Bug 3442] New: Regression: ssh -d with -o Connecttimeout= - does not show 'connection established' in the debug1 output

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3442

            Bug ID: 3442
           Summary: Regression: ssh -d with -o Connecttimeout= - does not
                    show 'connection established' in the debug1 output
           Product: Portable OpenSSH
           Version: 8.1p1
          Hardware: ix86
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: robert.mathieu at davita.com

REGRESSION: using -d with -o Connecttimeout= no longer displays
"debug1: Connection established." 


In OpenSSH_7.4p1 one could use the -o connecttimeout= to prevent the
connection attempt
hanging forever, and still check for the "debug1: Connection
established."
message to indicate that the TCP connection worked. 

In OpenSSH_8.1p1 the connection terminates without such a message, this
prevents
ssh -v -p PORT being used as network testing tool instead of telnet
host PORT.

I think this is a regression as when the -d option is used one would
always want to know
if the TCP connection was established as part of the debugging process.

ssh command used on RHEL 5,6,7,8, AIX 7.1, 7.2

Sample outputs below ( removed debug1: identity file lines )
names masked by: SERVER_NAME and 8.8.8.8

OpenSSH_5.3p1 - ssh -v -o connecttimeout=5

'''
ssh -V ; date ; ssh -v -o connecttimeout=5 -p 636 SERVER_NAME 2>&1 ;
date 
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
Fri Jun  3 12:57:24 PDT 2022
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to SERVER_NAME [8.8.8.8] port 636.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: permanently_set_uid: 0/0
Connection timed out during banner exchange
Fri Jun  3 12:57:29 PDT 2022
'''

OpenSSH_7.4p1 ssh -v

'''
# ssh -V ; date ; ssh -v -p 636 SERVER_NAME 2>&1 ; date
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
Fri Jun  3 14:15:12 MDT 2022
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to SERVER_NAME [8.8.8.8] port 636.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
ssh_exchange_identification: read: Connection reset by peer
Fri Jun  3 14:15:12 MDT 2022
'''

OpenSSH_7.4p1 ssh -v -o connecttimeout=5

'''
# ssh -V ; date ; ssh -v -o connecttimeout=5 -p 636 SERVER_NAME 2>&1 ;
date 
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
Fri Jun  3 12:58:40 PDT 2022
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to SERVER_NAME [8.8.8.8] port 636.
debug1: fd 3 clearing O_NONBLOCK
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
ssh_exchange_identification: read: Connection reset by peer
Fri Jun  3 12:58:40 PDT 2022
# 
'''

OpenSSH_8.1p1 - ssh -v 

'''
# ssh -V ; date ; ssh -v -p 636 SERVER_NAME 2>&1 ; date                 
OpenSSH_8.1p1, OpenSSL 1.0.2u  20 Dec 2019
Fri Jun  3 13:05:03 PDT 2022
OpenSSH_8.1p1, OpenSSL 1.0.2u  20 Dec 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: init_func_ptrs success
debug1: Value of krb5 is 1
debug1: Value of gssapi is 1
debug1: Connecting to SERVER_NAME [8.8.8.8] port 636.
debug1: Connection established.
debug1: Local version string SSH-2.0-OpenSSH_8.1
kex_exchange_identification: read: Connection reset by peer
Fri Jun  3 13:05:03 PDT 2022
# 
'''

OpenSSH_8.1p1 - ssh -v -o connecttimeout=5

'''
# ssh -V ; date ; ssh -o connecttimeout=5 -v -p 636 SERVER_NAME 2>&1 ;
date 
OpenSSH_8.1p1, OpenSSL 1.0.2u  20 Dec 2019
Fri Jun  3 12:59:20 PDT 2022
OpenSSH_8.1p1, OpenSSL 1.0.2u  20 Dec 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: init_func_ptrs success
debug1: Value of krb5 is 1
debug1: Value of gssapi is 1
debug1: Connecting to SERVER_NAME [8.8.8.8] port 636.
debug1: connect to address 8.8.8.8 port 636: Connection timed out
ssh: connect to host SERVER_NAME port 636: Connection timed out
Fri Jun  3 12:59:25 PDT 2022
# 
'''

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